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Rad115 > Laws > Flashcards

Laws Flashcards

1
Q

Inverse square law

A

Beam intensity is inversely proportionate to the distance from a source point

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2
Q

15 percent law increase

A

If your increase your KVP by 15% your exposure doubles

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3
Q

Maintenance for 15 percent rules

A

1

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4
Q

Reciprocity law

A

Same mAs from different MA and time
Example:
3mA • 2s= 6mAs
2mA • 3s= 6MAs

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5
Q

Window level

A

changes in brightness

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6
Q

15percent rules decrease

A

If you decrease your KVP by 15percent your expose rate is halved

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7
Q

Maintenance law

A

If you increase your KVP by 15 percent your exposure is halved

If you decrease your KVP by 15percent your expose is doubled

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8
Q

Window width

A

Controls the financial range on the monitor

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9
Q

High density

A

Lower your mas

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10
Q

Low density

A

Higher your mas

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11
Q

Photoelectric effect

A

Total absorption (gives you contrast)

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12
Q 
High contrast (60kvp)
Contrast 
Scale
Shades of gray 
KVP
A

High contrast
Short scale
Few shades of gray
Low KVP

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13
Q 
Low contrast (100kvp)
KVP 
Shades of gray 
Scale 
Frequency 
Wavelength
A

Low contrast
Longer scale
More shades of gray
High KVP

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14
Q

H and d log 3 other names

A

Sensitometric

D log e

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15
Q

Primary

A

Photons from source point

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16
Q

Secondary

A

Scatter

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17
Q

Remnant

A

Photons from patient to IR

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18
Q

30% rule

A

30% change in mas is required for viable change in density

19
Q

4-12%

A

4 to 12 percent in KVP is required for visible change in contrast

20
Q

What relationships does mAs have with density

A

Directly proportionate

21
Q

Increase in mAs has what affect on contrast

A

Negligible

22
Q

Increase KVP has what affect on contrast

A

Goes down (more scatter)

23
Q

Increasing source to image distance has what affect on contrast

A

Negligible

24
Q

Increasing object to image distance has what affect on contrast

A

Increase less scatter

25
Q

If I increase my grid what affect will that have on contrast

A

Increase (less scatter)

26
Q

If I increase my collimation what affect will that have on contrast

A

Go up (less scatter)

27
Q

Focal spot for both density and contrast are

A

Negligible

28
Q

If I increase my filtration what will happen to my contrast

A

Decrease (more scatter)

29
Q

If i increase my Part thickness my contrast will

A

Go down ( more scatter)

30
Q

Increasing my Atomic # will have what affect on contrast

A

Increase ( adjacent densities)

31
Q

Increasing Additive pathology will have what affect on contrast

A

Decrease ( more scatter )

32
Q

If I increase my distructive pathology my contrast will

A

Increase adjacent densities

33
Q

Increasing Radiopake and radiolucent will affect contrast how

A

Increase

34
Q

The controlling factor for radiographic contrast is

A

KVP

35
Q

The digital processing that produces changes I. The range of brightness, so it also is appropriate to use when controlling image contrast. What’s is this called

A

Window width

36
Q

Two photographic factors allow detail to be seen

A

Density and contrast

37
Q

An h & d curve demonstrating a steep curve represents image with

A

High contrast

Think steep curve

38
Q

How’s does the use of filtration affect contrast

A

Low contrast

39
Q

High energy radiation will result in

A

Long scale

Low contrast

40
Q

Which of the following will occur if exposure time is increased

A

Density will increase

41
Q

Which of the following factors will affect Radiographic density

A

Distance filtration anotomic size

42
Q

Considering reciprocity law which of the following will occur if exposure time is decreased

A

Mas will increase

43
Q

Which of the following affect radiographic density

A

(All)average atomic number
Thickness of anotomic part
Disease processes that decrease tissue density

Rad115 (2 decks)

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